ARM: pxa: mark unused eseries code as __maybe_unused

Two variables in eseries.c are used on multiple platforms,
but are not referenced when those are all disabled:

eseries.c:60:31: warning: 'e7xx_gpio_vbus' defined but not used [-Wunused-variable]
eseries.c:129:20: warning: 'eseries_register_clks' defined but not used [-Wunused-function]

Marking them __maybe_unused is the nicest way to ensure
that we never get the warning or end up with missing symbols
if we get it wrong.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/mach-pxa/eseries.c

@@ -57,7 +57,7 @@ struct gpio_vbus_mach_info e7xx_udc_info = {
 	.gpio_pullup_inverted = 1
 };
 
-static struct platform_device e7xx_gpio_vbus = {
+static struct platform_device e7xx_gpio_vbus __maybe_unused = {
 	.name	= "gpio-vbus",
 	.id	= -1,
 	.dev	= {
@@ -126,7 +126,7 @@ struct resource eseries_tmio_resources[] = {
 };
 
 /* Some e-series hardware cannot control the 32K clock */
-static void __init eseries_register_clks(void)
+static void __init __maybe_unused eseries_register_clks(void)
 {
 	clk_register_fixed_rate(NULL, "CLK_CK32K", NULL, CLK_IS_ROOT, 32768);
 }